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From Wikipedia, the free encyclopedia

A cosmological decade ( CÐ ) is a division of
the lifetime of the cosmos. The divisions are logarithmic in
size, on base 10. Each successive cosmological decade
represents a ten-fold increase in the total age of the
universe.[1]

As
expressed in log( seconds per Ðecade )

When CÐ is measured in log( seconds/Ð ),
CÐ 1 begins at 10 seconds and lasts 90 seconds (until 100 seconds
after Time Zero). CÐ 100, the 100th cosmological
decade, lasts from 10100 to 10101 seconds
after Time Zero. CÐ
is Time Zero.

The epochCÐ −43.2683 was
10(−43.2683) seconds, which represents the Planck time since the
big
bang (Time Zero). There were an infinite number of cosmological
decades between the Big Bang and the Planck epoch (or any other
point in time). The current epoch, CÐ 17.6355, is
10(17.6355) seconds, or 13.73(12) billion years, since
the Big Bang. There have been 60.9 cosmological decades between the
Planck epoch, CÐ −43.2683, and the current epoch,
CÐ 17.6355.

As expressed
in log( years per Ðecade )

Fred Adams and Greg Laughlin, in The Five Ages of the
Universe, first defined the cosmological decade as
expressed in log years per decade. In this definition, in the 100th
cosmological decade, lasts from 10100 years to
10101 years after Time Zero. To convert to this format,
simply divide by seconds per year; or in logarithmic terms,
subtract 7.4991116 from the values listed above. Thus when CÐ is
expressed in log( years/Ð ), the Planck time could also be
expressed as
10(−43.2683 − 7.4991116) years =
10(−50.7674) years.

In this definition, the current epoch is CÐ
(17.6355 − 7.4991116), or CÐ 10.1364. As before,
there have been 60.9 cosmological decades between the Planck epoch
and the current epoch.

In their view, the history of the universe can be segmented into
five Ages: